On 11/07/13 15:20, David Vrabel wrote: > On 08/07/13 14:03, Roger Pau Monne wrote: >> Improve the calculation of required grants to process a request by >> using nr_phys_segments instead of always assuming a request is going >> to use all posible segments. > > This isn't obviously correct to me. Why is this correct value for the > number of pages that need to be granted?
This contains the number of scatter-gather DMA addr+len pairs, which is basically what we put at every granted page. for_each_sg iterates over the DMA addr+len pairs and uses a grant page for each of them. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
